Develop Bugs

[Q] Hi, no OS on M8, flash rom in TWRP "some symlinks fail"

Hi,
Apologies in advance because I'm sure this is a very noob problem, but I was trying to update my M8 to lollipop and ended up messing it up somewhere. It was rooted before, S-Off, unlocked, using Android HD 4.4.4.
When I try to flash the Android HD Lollipop rom in TWRP from internal or external sdcard, or from USB OTG, the installer starts and looks successful until it gets to "Creating toolbox symlinks". After that it says "symlink: some symlinks failed"
When it finishes, it goes back into recovery and TWRP says "Successful"
When I go to reboot TWRP says it isn't rooted and asks if I'd like to root. Whether I say "yes" or "no" it reboots to a white HTC screen with a little lock at the bottom. The lock wasn't there when I started. After a few seconds the screen turns off then back on, then it goes into recovery.
If I try to install the update-supersu from internal or external card, or from USB OTG, in TWRP it says "success" and no errors, but then when I go to reboot it, it says "does not appear to be rooted" and asks if I'd like to root it. Whether I say yes or no it reboots, freezes, then boots into recovery and I start over.
In boot where it used to say "tampered" it now says "modified", and under that "unlocked", "s-off", a bunch of numbers that look important, but nothing in "OS-".
I can get into recovery and fastboot or hboot just fine. I have ADB, fastboot, and I think all the drivers I need on my laptop, and both recognize my phone when it's plugged in and I type "adb devices". I've tried like 10 different guides to push and flash and honestly too many commands to remember, but nothing that can get it to boot into a working rom.
To be honest, every single time I've tried to root something, I've broken something, but usually if I keep looking I can find the same problem and someone who's fixed it and figure it out, but I've been at it nearly 20 hours straight now and I just can't see what I'm missing (besides OS Dx)
If anyone knows what I've done and how to undo it, I'd be grateful for any advice.
Thanks,
Josh
*** I think I got the wrong firmware, but not sure how to find the right one without downloading them reandomly and checking the android-info***

Boot to bootloader/fastboot then run command fastboot getvar all
Post here the result (delete serial no. & imei no.)
Will see what we can do later
Your problem most probably is the old version of TWRP (2.7.0.2) that you use.
You should try 2.8.3.0 if you have a KitKat firmware and 2.8.5.0 if it is a Lollipop firmware.

Sure
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.21.213311491.A04G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader)
(bootloader)
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: c88f4560
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.016s

Blue67982 said:
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.21.213311491.A04G
(bootloader) product: m8_ul_ca
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__001
Click to expand...
Click to collapse
So you have a AT&T device.
What actually you want to do because there is no lollipop update for AT&T yet.
Since your device is S-Off, you can change
CID : CWS__001 to 11111111
MID : 0P6B12000 to 0P6B10000
then flash a EU firmware.
Or you take any unsigned EU firmware.zip, open it with 7-zip and extract out the android-info.txt and edit this android-info.txt to include your CID and MID (use notepad++ for this), drag the modded android-info.txt into the unsigned firmware.zip
Flash this modded firmware, should work too.
And important thing about TWRP : 2.8.3.0 if you have a KitKat firmware and 2.8.5.0 if it is a Lollipop firmware
Then you can install any of the lollipop Sense base custom ROM.

Thanks. I'll chug some coffee and give it a try.

Ok, I changed my CID and MID without too much trouble, but about "TWRP : 2.8.3.0 if you have a KitKat firmware and 2.8.5.0 if it is a Lollipop firmware", how can I tell which I have?
Oh, I used the ADB method if that matters.

After change of CID/MID, you need to flash firmware.zip in RUU mode not ADB.
Your current firmware is KitKat .. if you stick to it, you need 2.8.3.0
After you flash a 4.xx.xxx.x firmware - you need 2.8.5.0
Check this : http://forum.xda-developers.com/htc-one-m8/general/vomerguides-m8-bootldr-unlock-s-off-t2800727

Thanks for putting up with all the questions.
I just want to make sure I'm doing this correctly. I need to update the firmware to a 4x one, then twrp 2.8.5.0, then root and rom? I'm reading the guide you linked, but I'm not sure which firmware to use, for example it lists 5xxBase, then underneath it lists firmwares starting with 4xx.
Or does it not matter?

1. Update firmware, flash the widely use - 4.16.401.10
2. Flash TWRP 2.8.5.0
3. Install ROM
No need manual root because custom ROM is prerooted.
I got to go now .. be back in next 4 hrs

ckpv5 said:
flash the widely use - 4.16.401.10
Click to expand...
Click to collapse
TYSM!! That's what I was looking for

Ok, I updated the firmware and TWRP (I think), but when I try to do anything like flash a rom all the partitions come up as unmountable before the installer starts. I know I read something similar before so I'll try to find that.
\fastboot>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.25.214500021.06G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 3aa067db
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0

You don't seems be using the updated TWRP 2.8.5.0
Your fastboot shows that you may use the old 2.7.0.2
Download and install TWRP 2.8.5.0 - http://techerrata.com/browse/twrp2/m8
command fastboot flash recovery openrecovery-twrp-2.8.5.0-m8.img
Then boot to recovery - select wipe - advance - format data - yes
Go to reboot menu - select recovery (to reboot back to recovery
Select "Mount" menu - enable MTP
Transfer the ROM zip to either Internal Storage or MicroSD (if you have one)
Then try to install the ROM.zip

that's so weird...from within twrp the little info bar thing at the top says v2.8.5.0
Ill install again

Yeah .. unless you remove the (bootloader) version-main: info, TWRP 2.8.5.0 should not remove that after you flash the firmware.
Anyway ... try the other steps that I mentioned.

You did it man, you fixed the phone I thought I would have to throw away.
Thanks for answering so many noob quuestiuns
I owe you one

Blue67982 said:
You did it man, you fixed the phone I thought I would have to throw away.
Thanks for answering so many noob quuestiuns
I owe you one
Click to expand...
Click to collapse
Great :good::good:
You don't owe me anything ... just love to help

Since he had a at&t phone, why did you not tell him the change the cid to dev edition and run the ruu in fastboot mode, that wont have been easier?

toysoldierq said:
Since he had a at&t phone, why did you not tell him the change the cid to dev edition and run the ruu in fastboot mode, that wont have been easier?
Click to expand...
Click to collapse
Different ways to skin the same cat. There is nothing "wrong" with the solution that was used.

It worked, and now I know to make 100% sure I have the right versions of everything BEFORE I start, so I'm happy.

HTC One M8. Noob needs help fixing phone.

Hello, so quite sometime ago I rooted my phone, or unrooted it. I am not sure what the term is, I dont even remember why I done this in the first place. Anyways today I wanted to just put my phone back to like it was when I got it, and in doing so I have actually broke my phone I can't get my phone to boot up anymore, I always get a message saying I have no OS installed. I am really useless with all of this so I would appreciate it if there is a patient person out there who can help me get my phone back on and back to how it was when I recieved it. I am sure I need to add more information but I dont know what so please tell me what you guys need to know and I will try and provide the answers.

This should be the first rule when asking for help.
Post fastboot getvar all result (delete serial & imei no.)
Without this info, no one will be able to offer any help

ckpv5 said:
This should be the first rule when asking for help.
Post fastboot getvar all result (delete serial & imei no.)
Without this info, no one will be able to offer any help
Click to expand...
Click to collapse
Where do I find this?

Do you have fastboot & adb on your PC ? You should have one, if not how can you install a custom recovery and root your device before ?
If you're not sure .. install this : http://forum.xda-developers.com/showthread.php?t=2317790
Put your device in bootloader mode and connect to PC
Open a command prompt and type fasboot getvar all then "enter"
Copy the outcome and paste here

ckpv5 said:
Do you have fastboot & adb on your PC ? You should have one, if not how can you install a custom recovery and root your device before ?
If you're not sure .. install this : http://forum.xda-developers.com/showthread.php?t=2317790
Put your device in bootloader mode and connect to PC
Open a command prompt and type fasboot getvar all then "enter"
Copy the outcome and paste here
Click to expand...
Click to collapse
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.25.21331147A1.06G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: O2___001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dcdaa6e0
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
I think thats what you want right?.

Yes .. that's the one.
You have two options :
Option 1:
Install new stock ROM with a RUU - Download : https://www.androidfilehost.com/?fid=95916177934555499
you need to relock bootloader - run command fastboot oem lock
run RUU (right click the RUU and select run as administrator)
you need to use USB2.0 on your PC
RUU will wipe everything on your device including your files on internal storage
Option 2:
Restore a non-rooted TWRP backup 4.20.206.1
No need to relock bootloader
No internal storage wipes
Read how-to and all the needed files are here : http://forum.xda-developers.com/htc-one-m8/help/tutorial-how-to-stock-stock-twrp-t3086860
Good luck .. I have to sleep now, good night

ckpv5 said:
Yes .. that's the one.
You have two options :
Option 1:
Install new stock ROM with a RUU - Download : https://www.androidfilehost.com/?fid=95916177934555499
you need to relock bootloader - run command fastboot oem lock
run RUU (right click the RUU and select run as administrator)
you need to use USB2.0 on your PC
RUU will wipe everything on your device including your files on internal storage
Option 2:
Restore a non-rooted TWRP backup 4.20.206.1
No need to relock bootloader
No internal storage wipes
Read how-to and all the needed files are here : http://forum.xda-developers.com/htc-one-m8/help/tutorial-how-to-stock-stock-twrp-t3086860
Good luck .. I have to sleep now, good night
Click to expand...
Click to collapse
Option one just stays on updating 0/6 sending and nothing happens. Option 2 doesnt make sense to me, I really have no idea what most of it means.

Ok so this morning I tried option one again. It went through the first 6 stages fine, then it got stuck on the next set of stages at 1/7. When I restart my phone into the recovery screen type thing I have in red letters OS - (4.20.206.1) but I am still unable to start my phone up. I have disabled firewalls and also using USB2.0 when trying to do this process. Maybe this one that has been linked is not the right one for me? Or maybe I am doing something wrong?. I would really love to get my phone back working so all help is really appreciated.
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.25.21331147A1.06G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: O2___001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dcdaa6e0
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!

You have USB/Device connection problem. First it was 0/6 and now 1/7 ...
Which windows version that you use ? try with a Win7 PC .. I don't know many people cannot run RUU on windows higher version that Win7. I don't have problem on any windows version including my current Win 10.
What do you don't understand about option 2 ? It's very straight forward.
Install latest TWRP 2.8.6.0 or TWRP 2.8.7.0 (you need to reunlock bootloader because you relocked it for option 1)
Extract and copy the backup folder to TWRP backup on your device
Restore backup .. done
Or
Just install any of Sense based ROM that available in Development thread to get your device up & running ... then you can start that option 1 & 2 again
But seeing you mentioned OS - 4.20.206.1 in red, you need to get option 1 done because the firmware installation was incomplete

ckpv5 said:
You have USB/Device connection problem. First it was 0/6 and now 1/7 ...
Which windows version that you use ? try with a Win7 PC .. I don't know many people cannot run RUU on windows higher version that Win7. I don't have problem on any windows version including my current Win 10.
What do you don't understand about option 2 ? It's very straight forward.
Install latest TWRP 2.8.6.0 or TWRP 2.8.7.0 (you need to reunlock bootloader because you relocked it for option 1)
Extract and copy the backup folder to TWRP backup on your device
Restore backup .. done
Or
Just install any of Sense based ROM that available in Development thread to get your device up & running ... then you can start that option 1 & 2 again
But seeing you mentioned OS - 4.20.206.1 in red, you need to get option 1 done because the firmware installation was incomplete
Click to expand...
Click to collapse
Yes maybe I do but I am not sure why, maybe I need to look into seeing if my motherboard needs an update or if any windows updates are needed. I am on Windows 7 but like I said, it goes through the first 6 steps then as it boots the bootloader up again I hear the sound that my computer makes when plugging in a USB cable. However even if I leave it, it will not go past 1/7. But if I take the cable out it reconises I have done that so that makes me wonder if it is a USB problem?.
I dont understand option 2 because I dont know anything about all of this, I shouldnt have done it in the first place and I dont even remember why I did. I also must have deleted my backups as I cant find them. The part I was confused at, was which TWRP to get, then how to get it on my phone as my computer does not reconise my phone in the state it is in so I cant just go into the phone and place it. I also dont have an SD card with my phone either.
I will try updating my PC and try and get option 1 working and report back. Thank you for helping by the way, I really appreciate your patience with me.

Try also to install latest HTC USB driver.
Download HTC Sync Manager and install. Then uninstall the HTC Sync Manager but leave the HTC Driver installed.
http://www.htc.com/us/support/software/htc-sync-manager.aspx

Is there a way to wipe this OS version and try this whole thing again? I have found my 2.0 USB ports, I have tried a different cable and it still gets hung up. Only now it doesnt move past the 0/6 whereas it used to go through all of them then into the 1/7 and get stuck on this part. I also can try a different PC if need be.

KDK11 said:
I also can try a different PC if need be.
Click to expand...
Click to collapse
That is what I would suggest.
Also, does your PC have USB 3.0 on the ports? This has been known to cause problems with the RUU.

Ok so I have done the steps suggested now, when I uninstalled the HTC Sync Manager it let the process complete. It is now on a screen which says Android is upgrading, optimizing app 17-261. Is that my phone fixed? Or is there more I need to do now that it actually has turned on?.

KDK11 said:
It is now on a screen which says Android is upgrading, optimizing app 17-261. Is that my phone fixed?
Click to expand...
Click to collapse
Looks that way. It should boot into OS after its done optimizing all the apps, which is normally pretty slow (with that many, it will take 10 or more) since Android moved from Dalvik to ART.

Well I would like to say a massive thank you for the help I really appreciate the patience and help. So thank you again. I would have been lost without you's.

KDK11 said:
Ok so I have done the steps suggested now, when I uninstalled the HTC Sync Manager it let the process complete. It is now on a screen which says Android is upgrading, optimizing app 17-261. Is that my phone fixed? Or is there more I need to do now that it actually has turned on?.
Click to expand...
Click to collapse
That's it ... nothing else to do .. run the setup wizard and enjoy your device
KDK11 said:
Well I would like to say a massive thank you for the help I really appreciate the patience and help. So thank you again. I would have been lost without you's.
Click to expand...
Click to collapse
No problem .. glad that we could help

O2 RUU Marshmallow CID O2_001 pleaseee
Hi!
I have an HTC One M8 from O2 UK, that i give me a lot of problem after updating to Marshmallow.
After successfully complete the update i have done a factory reset which i guess it soft brick my phone.
It will show optimizing apps, after that starting apps and is stuck there until battery dies. I try many methods, formatting cache partition from recovery menu, made another factory restore from fastboot, I even left it plugged one night and nothing.
The only hope is if i find a RUU for CID O2_001
The phone is S-ON non rooted, i unlock then re lock boot loader thanks to htcdev website.
adb fastboot getvar command show this.
< waiting for device >
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.214500021.12G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.13.206.5
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: .................................................
(bootloader) imei: .......................................
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: O2___001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 76df2b54
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.126s
Please help me made the phone working again!
Thank you!

cossty said:
Hi!
I have an HTC One M8 from O2 UK, that i give me a lot of problem after updating to Marshmallow.
After successfully complete the update i have done a factory reset which i guess it soft brick my phone.
It will show optimizing apps, after that starting apps and is stuck there until battery dies. I try many methods, formatting cache partition from recovery menu, made another factory restore from fastboot, I even left it plugged one night and nothing.
The only hope is if i find a RUU for CID O2_001
The phone is S-ON non rooted, i unlock then re lock boot loader thanks to htcdev website.
adb fastboot getvar command show this.
< waiting for device >
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.214500021.12G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.13.206.5
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: .................................................
(bootloader) imei: .......................................
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: O2___001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 76df2b54
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.126s
Please help me made the phone working again!
Thank you!
Click to expand...
Click to collapse
Hello,
In this thread you will find the firmware for your phone. It looks like you know the process of installing your firmware, so if I were you I'd down load the proper firmware and try the whole process all over again.

Jerrel7 said:
Hello,
In this thread you will find the firmware for your phone. It looks like you know the process of installing your firmware, so if I were you I'd down load the proper firmware and try the whole process all over again.
Click to expand...
Click to collapse
Hi!
I didn't find because it is to new. It's an O2 UK, android 6 version, cid O2_001.
I did something else, i flashed TWRP recovery and then i flash latest InsertCoin rom, and now the phone it is working again.
Thank you!

Sunshine

I'm having a problem being able to launch apps on my One M8 ATT... I Don't have any apps on my home page and ATT Ready2Go keeps crashing on me. Can someone give me a command line so I can launch SunShine on my device through ADB, that way I can S-Off and go back to a different ROM.

Why would you need s-off to install a different rom ?

Mr Hofs said:
Why would you need s-off to install a different rom ?
Click to expand...
Click to collapse
The phone won't allow me to install anything through an RUU. Every RUU I've tried fails with a 155 Reason (Incorrect RUU) and shows "Loading zip file fail!" in the bootloader. A friend of mine has been working on it, got SunShine installed on the phone. But we want to run it to get the phone in to S-OFF. I'm not too savvy with ABD and that's what he's been using to talk to the phone. I also can't transfer items to the phone via USB even though I have drivers and MTP is running. The phone is a mess and I'm trying to avoid sending to HTC to restore it ($$$$$), or just telling my carrier that I "lost" it and pay the deductible to get a new one. Feels like I'm really close to fixing the phone, just not quite there yet.
If you know of a ROM I could try to flash, I'll give it a shot. I'm running out of options and time. Before I just get a new phone. My friend has helped me out a lot, but it's just not quite there yet.

isutke1287 said:
The phone won't allow me to install anything through an RUU. Every RUU I've tried fails with a 155 Reason (Incorrect RUU) and shows "Loading zip file fail!" in the bootloader. A friend of mine has been working on it, got SunShine installed on the phone. But we want to run it to get the phone in to S-OFF. I'm not too savvy with ABD and that's what he's been using to talk to the phone. I also can't transfer items to the phone via USB even though I have drivers and MTP is running. The phone is a mess and I'm trying to avoid sending to HTC to restore it ($$$$$), or just telling my carrier that I "lost" it and pay the deductible to get a new one. Feels like I'm really close to fixing the phone, just not quite there yet.
If you know of a ROM I could try to flash, I'll give it a shot. I'm running out of options and time. Before I just get a new phone. My friend has helped me out a lot, but it's just not quite there yet.
Click to expand...
Click to collapse
You need to relock your bootloader in order to run an RUU while you are S-On.
In fastboot: fastboot oem lock
Then run the proper RUU again.
I'd link you to the proper RUU, but you haven't given enough info.
In fastboot: fastboot getvar all and post the results minus your IMEI and ser# (private information), unless you already know what the proper RUU to run is already.

xunholyx said:
You need to relock your bootloader in order to run an RUU while you are S-On.
In fastboot: fastboot oem lock
Then run the proper RUU again.
I'd link you to the proper RUU, but you haven't given enough info.
In fastboot: fastboot getvar all and post the results minus your IMEI and ser# (private information), unless you already know what the proper RUU to run is already.
Click to expand...
Click to collapse
I'm not sure which RUU I need. Again, I'm very new to this, but here are the "fastboot getvar all" results:
C:\adb>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: [email protected]
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: *tsk tsk*
(bootloader) imei: *tsk tsk*
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 7f8e91a3
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.158s
Android version: 5.0.2
HTC Sense: 6.0
Software Number: 4.28.502.2
HTC SDK API level: 6.55
Not sure what you can tell from this, but I'll wait for a response before I do anything else. I'd also like to get the recent version of TWRP and SuperSU on here as well. Once it's up and running/stable. And.. this may be a dumb question, but I can unlock the bootloader again once I get an RUU to work successfully, right? (getting ahead of myself, I know)

isutke1287 said:
I'm not sure which RUU I need. Again, I'm very new to this, but here are the "fastboot getvar all" results:
C:\adb>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: [email protected]
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: *tsk tsk*
(bootloader) imei: *tsk tsk*
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 7f8e91a3
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.158s
Android version: 5.0.2
HTC Sense: 6.0
Software Number: 4.28.502.2
HTC SDK API level: 6.55
Not sure what you can tell from this, but I'll wait for a response before I do anything else. I'd also like to get the recent version of TWRP and SuperSU on here as well. Once it's up and running/stable. And.. this may be a dumb question, but I can unlock the bootloader again once I get an RUU to work successfully, right? (getting ahead of myself, I know)
Click to expand...
Click to collapse
The RUU you need can be found here.
Scroll down to the Manual System Update Instructions, and read them. The RUU download is at the end of the instructions.
You can unlock the bootloader again through HTCDev.com. After you are unlocked, flash TWRP from here in fastboot, then use that recovery to flash SuperSU from here.

xunholyx said:
The RUU you need can be found here.
Scroll down to the Manual System Update Instructions, and read them. The RUU download is at the end of the instructions.
You can unlock the bootloader again through HTCDev.com. After you are unlocked, flash TWRP from here in fastboot, then use that recovery to flash SuperSU from here.
Click to expand...
Click to collapse
I can NOT appreciate and thank you for your assistance in this! I went ahead and locked the bootloader and restored the original image with the RUU you linked me to, yesterday. Couldn't wait to try, haha. I had to sweet talk the HTC Live Chat person to tell me if I could use the RUU for the same software version as I had. Phone has been working like a champ. I'm gonna give it another day or two to settle in, do a few backups just in-case the flash doesn't go well.
I will definitely unlock the bootloader again and flash TWRP and SuperSU. But I imagine going S-OFF is just off the table right now since I'm a bit stripped of funds. I can afford it, haha, but my funds are already allocated towards adulting and such.
Again, THANK you for the support! This has been a learning experience.:good::good::good::good::good:

HTC 820 cannot enter TWRP recovery

The phone itself boots up fine, however whenever I try to load up recovery (I have flashed TWRP) some red text flashes, then it loads into fastboot.
I heard it might be a cache or bad TWRP file, however I have no idea how to fix either of them.
Any advice would be greatly appreciated.

IVIemories said:
The phone itself boots up fine, however whenever I try to load up recovery (I have flashed TWRP) some red text flashes, then it loads into fastboot.
I heard it might be a cache or bad TWRP file, however I have no idea how to fix either of them.
Any advice would be greatly appreciated.
Click to expand...
Click to collapse
Which ROM u running KK or LOLLI ?
TWRP for kk & Lo are in this ZIP
Download : https://mega.nz/#!yQ1RRZxK!fzcw9gdxgYd4Qd-8FTPoYuJroZ6RGHHkeb6381NncEo
how to flash here: https://www.youtube.com/watch?v=xsn6co4Ve6M

I tried flashing the stock recoveries, but it gave the same result. Whenever I select recovery, the 'entering recovery' text flashes for a second, then the phone goes into the fastboot menu.
I'm running KK by the way.

Whats you complete model number like 820U | 820n | 820Q | 820S
Here is Twrp recovery for kk https://mega.nz/#!zM8G2AwJ!6QH8eZYZ8aoe_ap_UGu1iLf_NnqsnD4bhHp2u42MH8k
Here is stock recovery for kk https://drive.google.com/file/d/0B2DumUOvI46KM2toeGR3QXpLYW8/view?pref=2&pli=1 [ for 820U ]
Code:
how to flash here [video guide: https://www.youtube.com/watch?v=xsn6co4Ve6M
More info :http://forum.xda-developers.com/desire-820/development/play-recovery-htc-desire-820-dual-sim-t3225782
Keep in mind to flash any custom recovery (twrp,cmw,philz touch) you need to have you bootlodder unlocked
If stock is not working can you may flash TWRP

The phone model in both settings and hardware info only displays as HTC_0PFJ50. Again, both flashes work fine, it's just that whenever I enter recovery, it goes into the fastboot menu instead of the recovery menu (bootloader has been unlocked).

IVIemories said:
The phone model in both settings and hardware info only displays as HTC_0PFJ50. Again, both flashes work fine, it's just that whenever I enter recovery, it goes into the fastboot menu instead of the recovery menu (bootloader has been unlocked).
Click to expand...
Click to collapse
Can you do "fastboot getvar all" and post the result here

Whenever I try that, it only comes up with the 'adb help' list, in fact all the adb commands ends up with the help menu apart from 'adb devices' which results in
(List of devices attached
HT57NYC00235 offline)
Fastboot getvar all ends with a endless <waiting for device>. USB debugging has been turned on.

IVIemories said:
Whenever I try that, it only comes up with the 'adb help' list, in fact all the adb commands ends up with the help menu apart from 'adb devices' which results in
(List of devices attached
HT57NYC00235 offline)
Fastboot getvar all ends with a endless <waiting for device>. USB debugging has been turned on.
Click to expand...
Click to collapse
which fastboot & adb drivers you have , you need HTC this
https://mega.nz/#!6BcyEYZT!fMpb8fsPwgQ8Hryci1z3YmMcN43tM0gZqydV3I8dz30

It was still giving the same thing, until I realized the device wasn't being recognized.
I installed the ADB driver in device manager and 'fastboot getvar all' got me this:
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: [email protected]
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 1.05.980.1
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: HT57NYC00235
(bootloader) imei: 355719062070426
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: a51_tuhl
(bootloader) platform: hTCBmsm8939
(bootloader) modelid: 0PFJ50000
(bootloader) cidnum: HTC__039
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 735c2625
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
(bootloader) mfg-name: 0001
all: Done!

IVIemories said:
It was still giving the same thing, until I realized the device wasn't being recognized.
I installed the ADB driver in device manager and 'fastboot getvar all' got me this:
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: [email protected]
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 1.05.980.1
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: HT57NYC00235
(bootloader) imei: 355719062070426
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: a51_tuhl
(bootloader) platform: hTCBmsm8939
(bootloader) modelid: 0PFJ50000
(bootloader) cidnum: HTC__039
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 735c2625
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
(bootloader) mfg-name: 0001
all: Done!
Click to expand...
Click to collapse
Code:
./
-Read me well before you flash this recovery
/.
THIS twrp recovery is for your model A51_TUHL, but for lollipop
hence, it won't run on your kitkat which you have rite now . Can you make OTA update from your phone & get lollipop but for that too you need to flash your working stock recovery & re-lock boot lodder.
After this is done Go for lollipop OTA update & when your phone will Run lollipop
After that again Unlock bootlodder,
Code:
fastboot flash unlocktoken unlock_code.bin
- Unlocking bootlodder will wipe your device so make all types of backup
After bootlodder is unlocked stay at bootlodder and flash this twrp recovery 2.8.7
To conclude i think there is no twrp for kitkat your model .
LINKS:
Download Link: https://drive.google.com/open?id=0B1rsNvL8ZF-RMHNab3VJNFVaNEE
TWRP discussion : http://forum.xda-developers.com/des...p-2-8-7-0-64bit-a51ul-a51tuhl-europe-t3287214
:good:

Flashing the stock recovery rom still doesn't allow me to enter recovery. Relocking the ROM and checking for software update tells me that my phone is up to date. (not sure if this has anything to do with having no recovery). Now the bootloader is stuck in 'relocked' mode, and trying to unlock it again fails because I cannot enter recovery.
I'm probably taking up too much of your time anyway, and since I can use my phone without any problems (just no root) I think I might as well give up at this point. Maybe i'll figure it out eventually after a lot of trial and error.
Regardless, thank you very much for the continued support!

Its your wish

h1dd3n_sn1p3r said:
Which ROM u running KK or LOLLI ?
TWRP for kk & Lo are in this ZIP
Download : https://mega.nz/#!yQ1RRZxK!fzcw9gdxgYd4Qd-8FTPoYuJroZ6RGHHkeb6381NncEo
how to flash here: https://www.youtube.com/watch?v=xsn6co4Ve6M
Click to expand...
Click to collapse
820n running LOLLlPOP rom . are these recoveries are compatible to flash on my device?

android201 said:
820n running LOLLlPOP rom . are these recoveries are compatible to flash on my device?
Click to expand...
Click to collapse
yes go ahead
BTW which you are going to flash ?

h1dd3n_sn1p3r said:
yes go ahead
BTW which you are going to flash ?
Click to expand...
Click to collapse
i need to flash again my device official rom or custom rom 820n a51_ul because it has a extraordinary screen saver. i need to remove it. i did factory reset but its still there.

android201 said:
i need to flash again my device official rom or custom rom 820n a51_ul because it has a extraordinary screen saver. i need to remove it. i did factory reset but its still there.
Click to expand...
Click to collapse
hmm ok

h1dd3n_sn1p3r said:
hmm ok
Click to expand...
Click to collapse
are these recovery compatible with the d820u ? i have a d820u running on lollipop with bootloader unlocked
edit :nvm i got twrp 2.8.7 working

Hi.
I seem to be having the same issue as the original poster - on the same model hardware, whenever I attempt to load into recovery, it appears the system starts loading it then immediately bails back to Fastboot mode. This occurs using the recovery image linked from this thread, as well as with various other recovery images that I've tried. Each recovery image loads into the phone without error, but every time the result is the same.
Otherwise the phone boots without issue and appears to operate normally. Note that I have successfully unlocked the boot partition.
I've included the output of "getvar all" below, however one thing that may be relevant that I have noticed is that when I load into HBoot there is a brief moment where it appears the phone is verifying *.zip images. It's too quick for me to get file names, but the only thing I can think of is that it looks like it's overwriting existing partitions with stock images every time HBoot loads. Is this a thing?
Any assistance would be appreciated.
Code:
# fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: [email protected]
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.17.980.3
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: HT54DYC00362
(bootloader) imei: 355719061276677
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: a51_tuhl
(bootloader) platform: hTCBmsm8939
(bootloader) modelid: 0PFJ50000
(bootloader) cidnum: OPTUS001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: a82a385a
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
(bootloader) mfg-name: 0001
all: Done!
finished. total time: 0.007s

Hi This seems to be the same issue that I'm having. Getting bootloop on everything, when i select recovery it bootloops. I relocked the bootloader now i get errors trying to unlock. I've tried to fastboot new recovery but get Signature verify fail. I'm not sure what happened to it as a friend brought it like this. they said they did the official update then it went in to bootloop. The bootloader said "RELOCKED" So i presume they've already rooted this and put a custom recovery on but then its been deleted when they've done the official update to lollipop.
On bootloader it says Software status: Official
This is the dual sim 820n version. I've asked for help in a few threads but with no replys but came across this thread which more or less fits what my issue.
Please this is driving me mad now. Thanks

h1dd3n_sn1p3r said:
Whats you complete model number like 820U | 820n | 820Q | 820S
Here is Twrp recovery for kk https://mega.nz/#!zM8G2AwJ!6QH8eZYZ8aoe_ap_UGu1iLf_NnqsnD4bhHp2u42MH8k
Here is stock recovery for kk https://drive.google.com/file/d/0B2DumUOvI46KM2toeGR3QXpLYW8/view?pref=2&pli=1 [ for 820U ]
Code:
how to flash here [video guide: https://www.youtube.com/watch?v=xsn6co4Ve6M
More info :http://forum.xda-developers.com/desire-820/development/play-recovery-htc-desire-820-dual-sim-t3225782
Keep in mind to flash any custom recovery (twrp,cmw,philz touch) you need to have you bootlodder unlocked
If stock is not working can you may flash TWRP
Click to expand...
Click to collapse
Mine is 820q on kk can you send me the correct link as the given link did not work

HTC One M8 stuck on bootloader

hi, thanks for letting me join. if this is posted in the wrong place im very sorry. My HTC One M8 is secondhand and Ive had it for about 1.5 years now. the other day it crashed and ended up in a boot loop. i have tried lots of stuff but to no help. is there a way i can load stuff on to the sd card to fix it. on two occations it has got to the setup screen but errors would not let me type wifi password so had to hard reset.
ive tried hard reset
ive tried recovery
ive tried wipecache/factory reset
ive tried factory reset......seemed to work on two occations but on setup came back with sense input error and google error.
the phone had all the newest updates and was unlocked to any network.
on bootlader its says....SOFTWARE STATUS MODIFIED
LOCKED
SECURITY WARNING
THEN LOTS OF GREEN WRITING.
any help would be great. thanks

Post the result of fastboot getvar all ( after removing serialno and imei )
Sent from my HTC M8 using XDA Labs

ahmed.ismael said:
Post the result of fastboot getvar all ( after removing serialno and imei )
Sent from my HTC M8 using XDA Labs
Click to expand...
Click to collapse
hi, im not sure if usb debug is on. will i still be able to get this info?

VMKDF said:
hi, im not sure if usb debug is on. will i still be able to get this info?
Click to expand...
Click to collapse
Yes
From fastboot mode ( no need for usb debugging )
Sent from my HTC M8 using XDA Labs

ahmed.ismael said:
Yes
From fastboot mode ( no need for usb debugging )
Sent from my HTC M8 using XDA Labs
Click to expand...
Click to collapse
hi, im sorry but new to all this bootloader stuff. here is what i see on phone. ill google how to get other info when i get home. cheers

VMKDF said:
hi, im sorry but new to all this bootloader stuff. here is what i see on phone. ill google how to get other info when i get home. cheers
Click to expand...
Click to collapse
cant upload photo. ill try when i get home. cheers

VMKDF said:
cant upload photo. ill try when i get home. cheers
Click to expand...
Click to collapse
you can just copy and paste the result here

ahmed.ismael said:
you can just copy and paste the result here
Click to expand...
Click to collapse
C:\Users\User>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.214500021.12G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.12.401.4
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: HTC__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 76df2b54
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.203s
C:\Users\User>

VMKDF said:
C:\Users\User>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.214500021.12G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 6.12.401.4
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: HTC__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 76df2b54
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.203s
C:\Users\User>
Click to expand...
Click to collapse
You can follow this post instruction ( skip the part of relocking bootloader )
https://forum.xda-developers.com/showpost.php?p=64926626&postcount=6
easy way :
Download the RUU.zip from the linked post and rename it to 0P6BIMG.zip then put it in your external sd card root and reboot to bootloader ( hboot )
It will ask you to update confirm it and wait for a few minutes till it finish and ask you to reboot,that's it
Sent from my HTC M8 using XDA Labs

downloading it now..... will let you know. thanks very much for your time

VMKDF said:
downloading it now..... will let you know. thanks very much for your time
Click to expand...
Click to collapse
get this error
device halted due to large image update fail!
press <power> to reboot
then !!image update FAIL!! after the reboot
tried this too
i select recovery, then press power and vol up once to get to the menu with ....apply update from sdcard
install/sdcard/0P6BIMG.zip
finding update package
opening update package
verifying update package
E:footer is wrong
E:signature verification failed
installation aborted

VMKDF said:
get this error
device halted due to large image update fail!
press <power> to reboot
then !!image update FAIL!! after the reboot
tried this too
i select recovery, then press power and vol up once to get to the menu with ....apply update from sdcard
install/sdcard/0P6BIMG.zip
finding update package
opening update package
verifying update package
E:footer is wrong
E:signature verification failed
installation aborted
Click to expand...
Click to collapse
you can't flash RUU in recovery mode !!!!!!!!!!!
you tried to flash using sd card ( formatted as fat32 ) or the fastboot method ????
you said earlier your bootloader is locked
if it's unlocked relock it

Sir you are a GOD!!!!!!!! Phone is back to normal.
I followed your instructions and my M8 is now back to normal.
Thank you so much for your help and time. You saved my phone.
Thanks again

htc bootloader info
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.29.213311711.15G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.31.425.2
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: mels_tuhl
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B6****
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 438ab579
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.047s

bsikazinga said:
htc bootloader info
Click to expand...
Click to collapse
Bootloader info is great. But if you are asking for help, you really need to tell us more about what is going on with the phone. I gather from the subject of the thread, that your device is stuck in bootloader. But how did it get to that state? Did it just happen spontaneously (while using the phone, or when you tried to turn the screen on after idle for a while, etc.?). Or were you trying to do something, like unlock bootloader, install custom recovery TWRP, root, flash custom ROM, etc. Or some other function, like install an OTA update? If trying to flash something, provide exact details like version numbers, file names; as well as exactly what happened when you tried to install (changes to status of phone, error messages, etc.).
Have you tried anything so far to resolve the problem? If so, describe exactly what you tried, again with any applicable file names, version numbers, and outcomes (error messages, etc.).
The more specific details you provide, the better we can help you.

Stuck can't get phone to connect to PC
Hi, I have an HTC One M8 which I just got secondhand, it's stuck on bootloader screen, usual messages ('modified' 'locked' etc)... I followed the instructions for RUU flash on other posts and am all set to go, but annoyingly my phone will not connect to any PC I use....I have installed the drivers etc...I am well used to using ADB, just can't get the phone to be recognised.
I also can't boot into recovery, just ends up back in the bootloader screen again. If it does try and boot it hangs at the logo screen....
Would welcome some ideas on where to go next....

GitManMatt said:
Hi, I have an HTC One M8 which I just got secondhand, it's stuck on bootloader screen, usual messages ('modified' 'locked' etc)... I followed the instructions for RUU flash on other posts and am all set to go, but annoyingly my phone will not connect to any PC I use....I have installed the drivers etc...I am well used to using ADB, just can't get the phone to be recognised.
Click to expand...
Click to collapse
adb won't work in bootloader mode, by definition. You want fastboot for running RUU, which is related to adb, but with important differences.
As long as you are in bootloader-fastboot mode (fastboot is highlighted near the top of the bootloader screen) which is often default if phone is connected by USB, you should be able to use fastboot. Try the command:
fastboot devices
And as long as the phone's ID is returned, you should be good to go.
If the command just results in "waiting for response" or an error, try a different USB cable, or a different USB port on your PC.

Still no go... Tried connecting on different ports and with different cables but just doesn't seem to work. Best I've managed is with the Aruuwizard tool which seemed to connect but I couldn't get much further. If I run fast boot devices it returns no device... Just a blank line....

Hello. I have a similar problem with my HTC One Mini. It's stuck in fastboot mode and trying to reboot/boot into recovery or factory reset does nothing...goes black for a sec and then back to fastboot mode. Bootloader is unlocked and it's S-ON. Any help much appreciated! Cheers!